The young family moved to a new apartment on the outskirts of the city and hired a babysitter for their newborn daughter. After being trusted, the night babysitter frightened the baby and his eldest son, Egore, who was trying to tell his parents about the nanny's strange behavior, but they didn't believe him. To calm his father down, he installed a surveillance camera, but everything was fine and nothing suspicious was found. Once Eagle came home, he couldn't find a babysitter or little sister. But parents are in a strange trance and don't remember that they have a daughter. Surprisingly, she took the child and all the toys and things were gone, as if she had never been here before. Egore and his friends went to look for it, believing that the nanny was actually an ancient demon, commonly known as Yaga. If they can't cope, their parents will forget them, too.